I use pieces of yarn that are a metre or two long to make mini granny squares {1 or 2 rounds, not granny's daughters}. I have a scrap afghan on the go where I join all of them into a cathedral windows-type pattern. This afghan has been a WIP for about three to four years now, and once done, will have reminders and memories of all the projects that "donated" to it. If you can crochet, it's just an idea.

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May all your projects be frog-less, and all your patterns error-free!